Ordering Arrays with Angular's Custom Pipe in a Custom Way

Question

Ordering Arrays with Angular's Custom Pipe in a Custom Way

I created a custom sorting function in my Angular application that arranges an array of objects based on a numerical property.

Here is an example where the custom pipe is utilized:

<div *ngFor="let product of products | orderBy:'price'">

Custom OrderByPipe Implementation:

export class OrderByPipe implements PipeTransform {
transform(array: any[], field: string): any[] {
array.sort((a: any, b: any) => {
  if (a[field] < b[field]) {
    return -1;
  } else if (a[field] > b[field]) {
    return 1;
  } else {
    return 0;
  }
});
return array;
}
}

While this custom sorting pipe works well with smaller arrays and when used with forEach loop, it seems to have issues maintaining the order when the final array is logged or displayed in the template.

If anyone has insights into what might be causing this issue, your help would be greatly appreciated. Thank you.

javascript angular typescript asynchronous

Answer 1

Answer №1

Perhaps you can avoid using a pipe altogether and instead utilize a service in your component.

originalProducts;
orderedProducts;

ngOnInit() {
    this.fetchProducts();
}

fetchProducts() {
  this.productsService.retrieveProducts()
    .subscribe((data) => {
    this.originalProducts = data;
    this.sortBy('price');  
  });
}

sortBy(field: string) {
    
        this.originalProducts.sort((a: any, b: any) => {
            if (a[field] < b[field]) {
                return -1;
            } else if (a[field] > b[field]) {
                return 1;
            } else {
                return 0;
            }
        });
        this.orderedProducts = this.originalProducts;
}

Incorporate the following code into your template:

<div *ngFor="let product of orderedProducts">

If your list is lengthy, consider implementing pagination for better user experience.

If you encounter issues, consider using lodash to assist in your operations.

Answer 2

Perhaps you can avoid using a pipe altogether and instead utilize a service in your component.

originalProducts;
orderedProducts;

ngOnInit() {
    this.fetchProducts();
}

fetchProducts() {
  this.productsService.retrieveProducts()
    .subscribe((data) => {
    this.originalProducts = data;
    this.sortBy('price');  
  });
}

sortBy(field: string) {
    
        this.originalProducts.sort((a: any, b: any) => {
            if (a[field] < b[field]) {
                return -1;
            } else if (a[field] > b[field]) {
                return 1;
            } else {
                return 0;
            }
        });
        this.orderedProducts = this.originalProducts;
}

Incorporate the following code into your template:

<div *ngFor="let product of orderedProducts">

If your list is lengthy, consider implementing pagination for better user experience.

If you encounter issues, consider using lodash to assist in your operations.

Answer 3

Answer №2

Can you clarify the items stored in the arrays? It appears that they may be objects, indicating the necessity of a custom comparator function to compare object instances accurately. Using the less-than (<) and greater-than (>) operators for comparison may not yield the expected results.

Answer 4

Can you clarify the items stored in the arrays? It appears that they may be objects, indicating the necessity of a custom comparator function to compare object instances accurately. Using the less-than (<) and greater-than (>) operators for comparison may not yield the expected results.

Ordering Arrays with Angular's Custom Pipe in a Custom Way

Answer №1

Answer №2

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